..To test whether the Communities That Care (CTC) prevention system reduces adolescent alcohol, tobacco, and other drug use and delinquent behavior communitywide...

Youth problem behaviors 8 years after implementing the communities that care prevention system: a community-randomized trial

J David HawkinsSocial Development Research Group, School of Social Work, University of Washington, SeattleJAMA Pediatr 168:122-9. 2014

..OBJECTIVE To test whether the Communities That Care (CTC) prevention system reduced levels of risk and adolescent problem behaviors community wide 8 years after implementation of CTC...

Sustained decreases in risk exposure and youth problem behaviors after installation of the Communities That Care prevention system in a randomized trial

J David HawkinsSocial Development Research Group, School of Social Work, University of Washington, Seattle, WA 98115, USAArch Pediatr Adolesc Med 166:141-8. 2012

..To test whether the Communities That Care (CTC) prevention system reduced levels of risk and adolescent problem behaviors community-wide 6 years after installation of CTC and 1 year after study-provided resources ended...

Design and analysis of the Community Youth Development Study longitudinal cohort sample